SVG-沿路径动画/移动点
Dek*_*kel 3 css svg css3 css-animations svg-animate
我正在寻找一种沿现有路径移动点的方法，以便获得如下所示的动画：
我当时正在考虑使用dasharray，但无法获得确切的行为。
这是我尝试过的示例，但如您所见，它实际上并不起作用：
path.link {
stroke-width: 3px;
stroke-dasharray: 5 5;
stroke: black;
}
path.link-anim {
stroke-width: 3px;
animation: link-anim 5s linear infinite;
}
path.red {
stroke: red;
}
path.blue {
stroke: blue;
}
path.green {
stroke: green;
}
path.pink {
stroke: pink;
}
@keyframes link-anim {
0% {
stroke-dashoffset: 0;
stroke-dasharray: 5 5 100%;
}
100% {
stroke-dashoffset: 100%;
stroke-dasharray: 100% 5 5;
}
}<svg width="450" height="450">
<g>
<path class="link" d="M10,10L100,10"></path>
<path class="link-anim red" d="M10,10L100,10"></path>
</g>
<g>
<path class="link" d="M50,50L200,50"></path>
<path class="link-anim blue" d="M50,50L200,50"></path>
</g>
<g>
<path class="link" d="M75,75L75,200"></path>
<path class="link-anim green" d="M75,75L75,200"></path>
</g>
<g>
<path class="link" d="M85,85L450,450"></path>
<path class="link-anim pink" d="M85,85L450,450"></path>
</g>
</svg>注意-线的角度与我无关。我应该从一开始就写这个。我需要的是向前移动的3个点（只有这3个点）。
您可以简单地复制路径，然后将顶部的笔划破折号数组设置为仅包含所需的3个点。
然后，可以为这些顶部路径的dashoffset属性设置动画。
请注意，它并不是真正的模块化，steps()需要根据路径长度来计算dashoffset，dash-array和计时函数。
path, circle {
stroke-width: 4px;
fill: transparent;
}
.bg {
stroke: white;
stroke-dasharray: 4 12;
}
.move {
stroke: red;
animation: link-anim 3s infinite steps(21);
stroke-dasharray: 4 12 4 12 4 300;
}
@keyframes link-anim {
0% {
stroke-dashoffset: 368;
}
100% {
stroke-dashoffset: 32;
}
}
body {
background: lightblue;
}<svg width="500" height="330">
<defs>
<path id="v_path" d="M30,20V288"/>
<path id="h_path" d="M30,20H358"/>
<path id="d_path" d="M30,20L228 228"/>
<circle id="c_path" cx="150" cy="150" r="53.4"/>
</defs>
<use class="bg" xlink:href="#v_path"/>
<use class="move" xlink:href="#v_path"/>
<use class="bg" xlink:href="#h_path"/>
<use class="move" xlink:href="#h_path"/>
<use class="bg" xlink:href="#d_path"/>
<use class="move" xlink:href="#d_path"/>
<use class="bg" xlink:href="#c_path"/>
<use class="move" xlink:href="#c_path"/>
</svg>我用 javascript 制作了一个路径动画（也在 IE 上运行）您也可以用这种方式对您的点进行动画处理。
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\r\n <!DOCTYPE html>\r\n <html>\r\n <head>\r\n <meta charset="utf-8">\r\n <meta name="viewport" content="width=device-width">\r\n <title>N\xc3\xbcrburgring Animation</title>\r\n <meta name="author" content="Frank Wisniewski">\r\n <meta name="publisher" content="Frank Wisniewski">\r\n <meta name="copyright" content="Frank Wisniewski">\r\n <meta name="description" content="Auf dieser Seite wird eine kleine Animation des N\xc3\xbcrburgrings um Adenau dargestellt. 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Die Animation wurde komplett in Javascript und SVG rtstellt.">\r\n <meta name="DC.Language" content="de">\r\n\r\n \r\n <style>\r\n body{font-family:"Calibri", "Helvetica", sans-serif;}\r\n .content{width:300px;margin-left:auto;margin-right:auto;}\r\n #svgG{width:200px;margin-left:auto;margin-right:auto;}\r\n svg{width:200px;height:200px;overflow:hidden;}\r\n h1,p{text-align:center;}\r\n p{font-size:8px;}\r\n .p10{font-size:14px;font-weight:bold;}\r\n </style> \r\n </head>\r\n <body>\r\n <div class="content">\r\n <div id="svgG"></div>\r\n <hr>\r\n <p>(c) Frank Wisniewski<br>Lohm\xc3\xbchlenstra\xc3\x9fe 2</br>53518 Adenau</p>\r\n \r\n </div>\r\n <script> \r\n /* Programm und Grafiken sind geistiges Eigentum von Frank Wisniewski, Lohm\xc3\xbchlenstra\xc3\x9fe 2, 53518 Adenau und d\xc3\xbcrfen ohne Genehemigung nicht genutzt werden */\r\n\r\n var carCount = 8;\r\n var i;\r\n var colors = ["Black", "Navy", "Blue", "BlueViolet", "CornFlowerBlue","Red", "LimeGreen", "IndianRed", "Sienna"];\r\n var svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");\r\n var _create = function (type){return document.createElementNS("http://www.w3.org/2000/svg", type);}\r\n var _set = function (el,par){for (key in par) {el.setAttribute(key.replace(\'X\',\'-\'),par[key]);}svg.appendChild(el);}\r\n with(svg){ \r\n setAttribute(\'width\', \'250\');\r\n setAttribute(\'height\', \'250\');\r\n setAttribute("viewBox", "0 0 250 250"); \r\n setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:xlink", "http://www.w3.org/1999/xlink");\r\n } \r\n svg.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:xlink", "http://www.w3.org/1999/xlink");\r\n svgG.appendChild(svg);\r\n var adenaubullet = _create("circle");\r\n _set(adenaubullet,{r:7,fill:\'#f00\',stroke:\'#f00\',cx:110,cy:8,strokeXwidth:1});\r\n var pfad = _create("path");\r\n pfad.setAttribute("d","M23.748,97.732c-4.235-2.956-3.875-3.774,0.149-6.424c4.415-2.912,9.246-4.657,13.445-7.991c3.775-2.997,6.616-6.559,8.157-11.154c0.658-1.969,0.469-3.708,0.928-5.656c0.49-2.073,2.818-3.084,2.289-5.231c-1.943-7.859,12.718-12.905,15.122-20.157c3.09-9.145-16.734-9.687-5.879-15.675c3.809-2.103,3.375-6.84,6.656-9.057c4.651-3.144,8.367,1.576,11.515,4.158c3.215,2.642,3.816-0.669,7.024-1.456c3.189-0.786,10.073,3.112,11.988-0.465c1.826-3.412,1.65-7.33,6.191-8.478c4.341-1.098,8.877-0.364,12.739-3.081c1.894-1.331,6.225-6.532,8.439-2.986c2.437,3.904-0.348,10.177,0.854,14.706c2.772,10.454,17.172,9.7,25.21,10.781c9.04,1.215,17.95,12.277,26.751,6.006c3.794-2.695,4.927-5.525,10.095-6.125c1.264-0.15,7.907-1.917,7.61,0.729c-0.316,2.853-6.305,5.333-8.338,6.711c-4.479,3.022-0.753,6.298,1.884,2.81c3.211-4.251,8.561-3.146,12.597-5.729c3.836-2.448,4.706-5.857,5.413-9.774c1.985-10.859,17.365-0.166,21.786,3.753c4.462,3.959,0.835,6.313,1.039,10.839c0.191,3.879,3.526,1.893,5.27,4.377c1.404,1.99,0.811,7.445-1.462,8.753c-3.792,2.168-6.586-2.64-9.273,2.805c-1.183,2.4-3.285,4.19-3.92,6.858c-0.735,3.091,1.969,7.785-0.122,10.477c-1.086,0.723-2.258,1.257-3.517,1.6c-1.907,1.228-3.592,3.089-5.258,4.608c-2.656,2.422-4.04,5.798-6.476,8.439c-3.986,4.336-10.271,6.805-16.063,7.526c-1.563,0.396-3.123,0.396-4.681,0c-2.271-0.944-1.521-3.241-4.827-2.771c-2.364,0.319-6.657,3.103-4.31,5.873c3.164,3.744,14.496,4.718,10.232,11.852c-4.087,6.844-13.375,9.795-19.857,13.7c-7.564,4.557-15.104,9.15-22.606,13.8c-7.321,4.53-16.081,8.639-22.572,14.298c-4.59,4.036-7.287,12.104-12.4,15.145c-2.264,1.35-1.265,4.361-4.132,5.722c-2.816,1.335-5.621-0.041-7.605-2.184c-0.949-1.027-2.493-4.413-4.188-2.536c-2.399,2.652-5.102,5.234-8.833,5.743c-3.432,0.466-6.206-1.944-9.507-1.572c-3.674,0.413-5.729-0.104-7.561-3.373c-1.255-2.242-3.559-3.075-5.613-4.396c-3.346-2.152-5.549-4.272-8.34-7.002c-5.066-4.96-13.847-9.133-14.34-17.222c-0.215-3.656,2.038-7.426,2.341-11.079c0.397-4.697-0.287-9.311-1.945-13.715c-1.431-3.801-3.489-7.284-4.994-11.039C29.209,99.368,26.926,99.928,23.748,97.732"); \r\n _set(pfad,{fill:\'none\',stroke:\'#666\',strokeXwidth:6});\r\n var bordstein=pfad.cloneNode(true);\r\n _set(bordstein,{stroke:\'#ddd\',strokeXwidth:4});\r\n var grandprix = _create("path");\r\n grandprix.setAttribute("d","M32.246,245.125c-2.99-2.644,4.779-6.693,6.57-8.077c3.212-2.479,6.842-4.163,5.87-8.961c-0.891-4.404,1.944-8.48,3.929-12.302c1.225-2.359,2.457-4.719,3.468-7.177c1.085-2.64,0.846-3.498-1.781-4.92c-2.916-1.579-8.019-3.264-4.406-7.271c3.643-4.035,7.452-7.957,11.752-11.297c3.277-2.547,7.475-2.651,11.457-3.249c1.722-0.26,13.399-0.733,13.39-2.918c-0.015-3.294,6.497-2.777,8.654-3.153c1.517-0.266,5.267-1.056,5.688,1.308c0.445,2.497-1.268,3.257-2.928,4.664c-7.362,6.223-15.047,12.292-22.803,18.019c-0.534,0.395-8.754,5.805-8.457,3.525c0.423-3.213,5.225-8.695,1.275-11.084c-2.188-1.332-4.133-0.486-6.367,0.376c-1.574,0.607-5.299,1.734-6.084,3.411c-0.74,1.58,0.625,3.774,2.29,3.882c1.022,0.069,3.515-1.991,3.427,0.323c-0.094,2.511,0.521,5.18-0.138,7.646c-0.792,2.955-2.661,5.646-4.08,8.322c-0.9,1.696-3.023,4.913-2.296,7.02c0.89,2.563,4.673,2.549,5.777,4.88c1.078,2.279-4.431,3.46-5.976,4.184c-2.971,1.387-5.743,2.851-8.27,4.98c-1.822,1.534-3.684,3.438-5.079,5.381C35.841,244.419,34.963,247.523,32.246,245.125");\r\n _set(grandprix,{fill:\'none\', stroke:\'#000\', strokeXwidth:4});\r\n var grandprixbordstein=grandprix.cloneNode(true);\r\n _set(grandprixbordstein,{stroke:\'#f00\',strokeXwidth:3});\r\n var myText=_create("text");\r\n with (myText){\r\n setAttribute("font-family", "Arial, sans-serif");\r\n setAttribute("font-weight", "bold");\r\n setAttribute("font-style", "italic");\r\n setAttribute("text-anchor", "middle");\r\n }\r\n var myTextNode = document.createTextNode("");\r\n myText.appendChild(myTextNode);\r\n var nordschleife=myText.cloneNode(true);\r\n _set(nordschleife,{x:120,y:77,fontXsize:16});\r\n nordschleife.textContent="NORDSCHLEIFE";\r\n var grandprixtext=nordschleife.cloneNode(true);\r\n _set(grandprixtext,{x:110,y:220,fontXsize:16});\r\n grandprixtext.textContent="GRAND-PRIX";\r\n var grandprixtext1=nordschleife.cloneNode(true);\r\n _set(grandprixtext1,{x:110,y:240,fontXsize:16});\r\n grandprixtext1.textContent="STRECKE";\r\n var adenautext=nordschleife.cloneNode(true);\r\n _set(adenautext,{x:165,y:14,fontXsize:16});\r\n adenautext.textContent="ADENAU";\r\n var roundSquare=[];\r\n var mySquare=_create("rect");\r\n var roundBullet=[];\r\n var roundBulletText=[];\r\n for (i=1;i <= carCount;i++){\r\n \r\n roundBullet[i]=adenaubullet.cloneNode(true);\r\n _set(roundBullet[i],{r:5,strokeXwidth:0,fill:colors[i],stroke:colors[i],cx:180,cy:120+i*5*3});\r\n \r\n roundSquare[i]=mySquare.cloneNode(true);\r\n _set(roundSquare[i],{x:203,y:113+i*5*3,fill:\'#ddd\',stroke:\'none\',height:13,width:30});\r\n \r\n roundBulletText[i]=adenautext.cloneNode(true);\r\n _set(roundBulletText[i],{x:210,y:125+i*5*3,fontXsize:14,fontXstyle:\'normal\'});\r\n roundBulletText[i].textContent="0";\r\n }\r\n var lapsText=nordschleife.cloneNode(true);\r\n _set(lapsText,{x:217,y:122,fontXsize:14,fontXstyle:\'normal\'});\r\n lapsText.textContent="LAPS";\r\n var cars = [];\r\n var step=[];\r\n var laps=[];\r\n var len = pfad.getTotalLength();\r\n var speed = 1.5;\r\n var pos = [];\r\n var pt;\r\n var repeater;\r\n var lapPos = [];\r\n var carProto = _create("circle");\r\n with (carProto){\r\n setAttribute("r", 3);\r\n setAttribute("stroke-width", "1");\r\n }\r\n for(i = 1; i <= carCount; i++){\r\n cars[i]=carProto.cloneNode(true);\r\n pos[i]=i*5+750;\r\n laps[i]=0;\r\n lapPos[i]=750;\r\n pt=pfad.getPointAtLength(len/1000*pos[i])\r\n _set(cars[i],{cx:pt.x,cy:pt.y,stroke:colors[i],fill:colors[i]});\r\n step[i]=speed+Math.random()/1;\r\n }\r\n var animate=function(){\r\n for(i = 1; i <= carCount; i++){\r\n pos[i]+=step[i];\r\n lapPos[i]+=step[i];\r\n if(pos[i]>1000){\r\n pos[i]=1;\r\n step[i]=speed+Math.random()/2; \r\n }\r\n if (lapPos[i]>1750){\r\n lapPos[i]=750;\r\n laps[i]++;\r\n roundBulletText[i].textContent=laps[i];\r\n }\r\n pt=pfad.getPointAtLength(len/1000*pos[i])\r\n cars[i].setAttribute("cx", pt.x);\r\n cars[i].setAttribute("cy", pt.y);\r\n }\r\n //repeater = requestAnimationFrame(animate);\r\n repeater = setTimeout(animate,1000/60);\r\n }\r\n animate();\r\n\r\n </script>\r\n </body>\r\n </html>